API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

RISK-BASED INSPECTION METHODOLOGY, PART 3, ANNEX 3.A—BASIS FOR CONSEQUENCE METHODOLOGY 3.A-17
Table 3.A.3.4—Specific Event Probabilities—Instantaneous Release Autoignition Likely
Fluid
Probability of
Ignition
Final Liquid State—Processed Above AIT
C1-C2 0.7 0.7
C3-C4 0.7 0.7
C5 0.7 0.7
C6-C8 0.7 0.7
C9-C12 0.7 0.7
Probabilities of Outcome
VCE Fireball Flash Fire Jet Fire Pool Fire
C13-C16
C17-C25
C25+
H2 0.9 0.9
H2S 0.9 0.9
Styrene 1 1
Final Gas State—Processed Above AIT
Fluid
Probability of
Ignition
Probabilities of Outcome
VCE Fireball Flash Fire Jet Fire Pool Fire
C1-C2 0.7 0.7
C3-C4 0.7 0.7
C5 0.7 0.7
C6-C8 0.7 0.7
C9-C12 0.7 0.7
C13-C16
C17-C25
C25+
H2 0.9 0.9
H2S 0.9 0.9
Styrene 1 1
NOTE 1 Shaded areas represent outcomes that are not possible.
NOTE 2 Must be processed at least 27 °C (80 °F) above AIT.